31423256121512 has 8 divisors (see below), whose sum is σ = 58918605227850. Its totient is φ = 15711628060752.

The previous prime is 31423256121511. The next prime is 31423256121547. The reversal of 31423256121512 is 21512165232413.

It can be written as a sum of positive squares in only one way, i.e., 25785129344836 + 5638126776676 = 5077906^2 + 2374474^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31423256121512² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31423256121511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1963953507587 + ... + 1963953507602.

Almost surely, 2^{31423256121512} is an apocalyptic number.

It is an amenable number.

31423256121512 is a deficient number, since it is larger than the sum of its proper divisors (27495349106338).

31423256121512 is a wasteful number, since it uses less digits than its factorization.

31423256121512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927907015195 (or 3927907015191 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The spelling of 31423256121512 in words is "thirty-one trillion, four hundred twenty-three billion, two hundred fifty-six million, one hundred twenty-one thousand, five hundred twelve".